Patent GB-186309-A (GB)
Title: Improvements in and relating to surface measuring machines, particularly intended for the measurement of leather
IPC: G01B5/26
Filed: 1922-06-23
Abstract: 186,309. Krupp Akt.-Ges., F. Sept. 23, 1921, [Convention date]. Surface areas, computing.- A machine of the Sawyer type, particularly suitable for r measuring leather, is provided with means to compensate for the " error of thickness " and the " tooth-error." Each contact roller B is carried by a crank lever D pivoted at C and having at the other end a setscrew E. One end of a lever G pivoted to the frame of the machine, is kept in engagement with the screw E by a spring F and a pivot pin g<1> on the other end carries a ratchet pinion H. Rigidly carried by the pinion H is a disc H' having two pins h<2> engaging slots m' in a disc M, and two other slots m<2> are engaged by pins b<1> of the roller B, which lies on the other side of the disc M. The ratchet-wheel K is freely mounted on the shaft K<1>, which is rotated from the driving-roller A in a counter-clockwise direction by gearing K<2>, N, P, P', a' and a pulley K<3>, rigid with the wheel K, is connected with the shaft K<1> by a friction clutch and with the scale dial of the adding mechanism by a band K<5>. There is a permanent pull in the direction X on this bank K<5> and a pin K<6> on the wheel K and a stop a<2> prevents the wheel K from rotating, as shown in the position of rest, Fig. 1. Pivoted to the frame is a double-armed lever RR<1>, which rotates stiffly on its pin r<2> and carries at one end a pawl Q. At the other end is a surface r<3> partly plane and partly curved in such a manner that the errors mentioned are allowed for. With the plane portion engages an arm T of a weighted double-armed lever T, T<1>, pivoted to the lever D. But for the fact that the weight t<2> rests on lever D, this weight would rotate the wheel K, through the lever R, R' and pawl Q, in a clockwise direction. On feeding a piece of leather W over the roller A, the rollers B are lifted, turning the levers D and allowing springs F to act so that each pinion H engages its respective ratchet-wheel K, rotating the latter clockwise against the action of the friction clutch. When the lever D is turned, the arm T tends to rotate the lever R, R<1> clockwise, thus rotating the wheel K clockwise through the pawl Q. This wheel K, however, has already been positively connected, by the disc M and pinion H, to the driving-roller A, and is therefore rotated by the roller A likewise in clockwise direction; since this rotation is a slower rotation than that due to part Q, the latter is retarded so that the weight t<2> is lifted off the lever D. The pawl Q thus follows the rotation of the wheel K without affecting the measurement and the curvature of the surface r<3> is such that the weight t<2> comes to rest on the lever D, which is once more stationary, as soon as the wheel K and pawl Q have moved by an amount corresponding to the error oi thickness. When the leather has passed beyond the roller A, the rollers B are lowered, the levers D rotate clockwise and the levers T, T<1> reassume their initial position shown in Fig. 1. Each lever R, R' tends accordingly to rotate counter-clockwise, but is unable to do so as it only rotates stiffly on its pin r<2>. The pinions H are already, however disengaged from the wheels K. and the latter are driven in a counter-clockwise direction from the roller A by the friction clutches opposite to arrow Y until the plane part of r<3> touches the arm T. Thus the wheels K and the scale dials have been rotated backwards by an amount exactly corresponding to the error of thickness. The curvature of r<3> may further be such as to compensate also for the " tootherror. "